174 SKULL OF ARMADILLOS CHAP.
half jaw, of which one is often implanted in the premaxilla.
The Armadillos show their alliance with the other American
Edentates in the points enumerated ahove. Their teeth specially
ally them to the Sloths, while the salivary and digestive organs
generally are on the Anteater plan, but present a less extreme
development. There are, however, caeca, paired as in birds, in
the genera Dasypus and Chlamydophorus. The others have none.
But there is a dilatation at the commencement of the large
intestine, which is not very different from the slightly-developed
caeca of Dasypus.
There are certain peculiarities in the skeleton, which dis-
tinguish this family.
The skull in the Armadillos presents a number of likenesses
to the other American Edentates.1 The premaxillaries are
FIG. 99.—Skull of Armadillo. Dasypus sexcinctus. x §. ex.oc, Exoccipital ; fr,
fi-outal ; viax, maxilla ; nets, nasal ; jpar, parietal ; peri, periotic ; jj.masc, pre-
m ax ilia ; s.oc, supraoccipital ; sy} s<juaraosal; t~y^ tympanic. (From Parker and.
Has well's Zoology.)
small, hut are larger in Dasypus than in Tatusia. On the other
hand the lachrymals are larger in the latter. The zygomatie arch
is complete, but there is no downward process as in the Sloths.
In Tatusia (but not in Dasypus) the " short thick pterygoids add
somewhat to the hard palate." This is clearly a beginning or a
remnant of the quite crocodilian character of the palate of
Myrmecophaga. In the cervical vertebrae we see the "Whale-like
character of fusion between individual vertebrae; and also, as
in the Whales, the degree to which this fusion is carried out
1 3f»r tlie anatomy of several forms, see Garrod, Proc. Zool. *Soc. 1878, p. 222,
Tsrho emotesBother memoirs.